This building at the Beelitz Heilstätten has probably the biggest rooftop forest in the world. It’s part of the hospital complex here and was abandoned after a bombing raid during the second World War.

I actually went to Ellis Island to solve a family mystery, which I was able to. During a break a noticed a sign about a hard hat tour of the abandoned immigrant hospital. Immediately I went into Indiana Jones mode and booked the two hour long tour.